Chiral Topological Superconductors Enhanced by Long-Range Interactions
Name
PhysRevLett.120.017001.pdf
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362.38 KB
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Author(s)
Martin-Delgado, Miguel Angel
Viyuela Garcia, Oscar
Fu, Liang
Date Issued
January 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Viyuela, Oscar et al. "Chiral Topological Superconductors Enhanced by Long-Range Interactions." Physical Review Letters 120, 1 (January 2018): 017001 © 2018 American Physical Society
Version
Final published version
Abstract
We study the phase diagram and edge states of a two-dimensional p-wave superconductor with long-range hopping and pairing amplitudes. New topological phases and quasiparticles different from the usual short-range model are obtained. When both hopping and pairing terms decay with the same exponent, one of the topological chiral phases with propagating Majorana edge states gets significantly enhanced by long-range couplings. On the other hand, when the long-range pairing amplitude decays more slowly than the hopping, we discover new topological phases where propagating Majorana fermions at each edge pair nonlocally and become gapped even in the thermodynamic limit. Remarkably, these nonlocal edge states are still robust, remain separated from the bulk, and are localized at both edges at the same time. The inclusion of long-range effects is potentially applicable to recent experiments with magnetic impurities and islands in 2D superconductors.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.120.017001
